Blue sulfur dye and process of making same.



Unitarian salaries PATENT #OFFICE.

AUGUST Laoronn LAsKA AND eEo e LIST, or oFFENBAou-oii rinia "MAlN, GERMANY, ASSIGNOES TO CHEMISCHE'FABRIK ealnsnnnug ,snacirreou, or FaAnKFoRr-our m- AIN, GERMANY, A JCORPOE RATION.

aLuE SULFUR D'YE' AND ROQEss-QF- MAKING SAME- No. 841,877. I

To all whom) it may concern- Be it known that we, AUGUST LEOPOLD LASKA; doctor of philosophy, chemist, and GEORG Lrsr, doctor of science, chemist, res1- dent's of 5 Gerberstrasse res 37 Ob'ermainstrasse, Offenbach on the ain, in Grand Duchy of Hesse, German Empire, have in vented new and useful Improvements in Blue Sulfur Dyes and Processes of Making Same, oflwhich the following is a specification.

We have found that by heatingmonoalkylpara l-amidoaneta l chlor-para-0xydip ienylamins with alkaline polysulfids under l certain conditions blue dyestuffs of great amin 'derioatioes.-Mix a so amidophenol in fifteen hundred parts of water and four hundred .parts of hydrochloric acid, (20 Baum, with asolu tion of four hundred and twenty-five parts of orthochlormonomethylanilin, '(described by Friedlaen der in the M onats'hefi'e fill Chmte 1898, page 638,) in three thousand five hundred partsof Water and seven hundred parts of sulfuric acid, (66 Baum.) Cool the whole by adding .40

ice and allow, stirring meanwhile, a solution of sun hundred parts .zof sodium blc'hroniate in two thousand parts of water to flow in quickly. Keep the temperature below zero centigra'de during the reaction. The indol I acid with phenol is formed quickly and partially separates out in-,.a crystallinelform. It IS easilysoluble: in'alcohol with a dark blue color.

- When oxidation is ended, add a solutionof twothousand six hundred and fifty parts of caustic-soda l e (35 Baumyandafterward a'solution of e even hundred parts of crystal- Specification of Letterslatent.

Application filed March 21, 1906. Serial No. 807372; (Specimens) color.

The di- .amido meta lchlor diphenylarnm and thirty I Patented Jan. 22, 1 907;

' lized' sodium sulfid in two thousand parts of 4 water'a-nd heat the whole bynieans of direct 1 The para oxy para steam to 70centigrade. I-rnethylamido meta I chlor-diphenylamin" goes into solution, whereas chromium byrate remains undissolved and may be re moved by filtering. To the hot filtered solution add three thousand four hundred and fifty parts of hydrochloric acid (20 Bauin) and filter off from insoluble impurities. The separation of the hydrochloric base from the cooled filtrate may be com )leted by the addition ofcommon salt. hydrochloric base forms 'nee-dlesof a greenish.

of centigrade. are rapidly oxidized by the oxygen of the ai The para oXy-para l-amidoethyl meta chlor diphenylamin may be obtained in the same manner. centigrade. In order to trans para oxy para l-ethylamido meta 1 chlor diphenylarnin into a lue sulfur dyestuff, we proceed, for instance, as follows; i

Eacample I I-Prepardtioh of the dyestu a Two hundred and forty parts of crystal ized sodium sulfid, ninety-six parts of sulfur, and fifty parts of water are melted together, .an as soon as the sulfur be dissolved seventy-foj and a half parts or para oxy para'hethy Tie thus obtained The free base shows a meltirig-pointi Alkaline solutions of it;

It shows a meltingpoiilt g i? orm t e five parts of caustic-soda lye (35 Baum are introduced at a temperature of about 50 centigrade. The solutionis evaporated till the temperature has risen to about 1 15 cen-, j

tigrade. during fourteen hours.

This temperature; 1s maintained The melt is dissolved in two thousandfive hundred parts of water,

the solution filtered, and' the coloring-matter recipitated by introduemg a current of air:--;; he thus obtained d estufl is a black-violet powder, almost inso uble' in water, alcohol,-

glacial acetic acid, and benzene. It dissolves in hot lycerin and concentrated sulfuric danted cotton,which are very'fast lac-washing, A

to'li ht, and acids.

T e dyestuff of the methylized base may a dark-blue color andlin water in'gi be obtained in the same manner. Ttdyes dls 'rect blue shades on cotton. The general properties of the dyestufl,' however, remain the 'same.

In melting together the base With sulfur and sodium sulfid the proportion of sulfur to sodium sulfid must be such aone that alkaline trisulfid or pentasulfid can be formed. N OW What We claim, and desire to secure by Letters Patent, is the following: I

1. The rocess of producing blue sulfur y heating monoalkyl para 1- amido-meta 1 "chlor-para-oxydiphenylamins with polys'ulfids substantially as described.

2. The blue sulfur dyes obtainid from inonoalkyl para 1-amido-1n'eta l chlor-para-' ox 'dipheny alnins by heating with alkaline poysulfids which in a dry state are dark-viov let owders almost insoluble in pure water, alco o1, benzene andglacial acetic acid easy soluble in hot glycerin and concentrated suh 

